Printable Hard Sudoku

Set 101txha. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
7 2 6 5
6 5
1 9 6 4
9 8 7 6
1
4 8 7
9 4 7
4 7 2
5 8 6 2 1
Hard #2
7 4 1
2 4 6 9
5 9 3
2 4
2 4 5
4 1 6 2
3 7 4 1 6
8 7 4 1 3
Hard #3
1 4 3 5
5 8 2
2 1 9
7 3 6 4
9 4 5 7
5 4 2
8
1 6 7
6 2 3 9
Hard #4
4 2 5
3 8 6
8
1 7 3 2
5 9 3 1
7 4 2 6 8
6
4 7 2 8 5
8 6 9
Hard #5
9 1
6 8
2 6 1 3 5 4
4 2 9
3 6 4
9 5 7
1 2 5 8
6 2 1
4 9 2
Hard #6
2 6 7 8
5 2 1
3 9 1 4
1 2 5 9
7 2
3 9
2 6 5 7 4
8
8 9 4 3
Hard #7
4 1 2
3 7 6 5 9
1 3 6 7
9 7 1
8 2 1 4
7 2
7 2 5 4 1
1 3 8
Hard #8
8 7
2 5 4 8 1
3
9 1
5 2 6
3 4 6 9
8 7 2
9 2 6 3 8
6 2 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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